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Carbon processing by the benthic ecosystem and benthic C fixation in methane-rich sediments on the South Georgia margin

Published online by Cambridge University Press:  18 March 2019

Clare Woulds Open the ORCID record for Clare Woulds [Opens in a new window] ,
James B. Bell ,
Adrian G. Glover ,
Steven Bouillon  and
Louise S. Brown
Clare Woulds*
Affiliation:
School of Geography, University of Leeds, Leeds LS2 9JT, UK
James B. Bell
Affiliation:
School of Geography, University of Leeds, Leeds LS2 9JT, UK Cefas, Pakefield Road, Lowestoft, NR33 0HT, UK
Adrian G. Glover
Affiliation:
Life Sciences Dept., Natural History Museum, Cromwell Rd, London SW7 5BD, UK
Steven Bouillon
Affiliation:
Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
Louise S. Brown
Affiliation:
School of Geography, University of Leeds, Leeds LS2 9JT, UK Cefas, Pakefield Road, Lowestoft, NR33 0HT, UK
*
[email protected]
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Abstract

As bottom water warms, destabilisation of gas hydrates may increase the extent of methane-rich sediments. The authors present an assessment of organic carbon processing by the benthic community in methane-rich sediments, including one of the first investigations of inorganic C fixation in a non-hydrothermal vent setting. This topic was previously poorly studied, and there is much need to fill the gaps in knowledge of such ecosystems. The authors hypothesized that benthic C fixation would occur, and that a high biomass macrofaunal community would play a substantial role in organic C cycling. Experiments were conducted at a 257 m deep site off South Georgia. Sediment cores were amended with 13C and 15N labelled algal detritus, or 13C labelled bicarbonate solution. In the bicarbonate experiment, labelling of bacteria-specific phospholipid fatty acids provided direct evidence of benthic C fixation, with transfer of fixed C to macrofauna and dissolved organic carbon (DOC). In the algae experiment, macrofauna played an active role in organic carbon cycling. Compared to similar experiments, low temperature supressed the rates of community respiration and macrofaunal C uptake. While benthic C fixation occurred, the biological processing of organic carbon was dominantly controlled by low temperature and high photic zone productivity.

Keywords

13Ccarbon cyclechemosynthesisisotope tracermacrofaunaseep
Type
Biological Sciences
Information
Antarctic Science , Volume 31 , Issue 2 , April 2019 , pp. 59 - 68
Copyright
Copyright © Antarctic Science Ltd 2019 

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